12606321 has 32 divisors (see below), whose sum is σ = 21054208. Its totient is φ = 6531840.

The previous prime is 12606317. The next prime is 12606331. The reversal of 12606321 is 12360621.

It is a happy number.

It is not a de Polignac number, because 12606321 - 2² = 12606317 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12606301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16275 + ... + 17031.

It is an arithmetic number, because the mean of its divisors is an integer number (657944).

Almost surely, 2^12606321 is an apocalyptic number.

It is an amenable number.

12606321 is a deficient number, since it is larger than the sum of its proper divisors (8447887).

12606321 is a wasteful number, since it uses less digits than its factorization.

12606321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 841.

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 12606321 is about 3550.5381282279. The cubic root of 12606321 is about 232.7355826954.

Adding to 12606321 its reverse (12360621), we get a palindrome (24966942).

The spelling of 12606321 in words is "twelve million, six hundred six thousand, three hundred twenty-one".